Alberta ranks third among provinces when it comes to High School graduation levels at 89.9%, just slightly behind BC 91.4%, and Ontario 90.6% The rest of the provinces in Canada are a fair bit lower, especially the Maritime provinces. The booming economy from 2004 to 2015 put a damper on high school graduations as jobs were plentiful, so we'll see how the stats shake out as time goes on. I bet a lot more students in Alberta have stayed in school the past 5 years due to the economy.
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Those numbers may be only Alberta residents and not anyone working in Alberta. As
@Mountain Man said, up north you see a lot of people working who don't high school educations, but also most of those people aren't from Alberta. In my time working in Northern Alberta most people I met that didn't have high school educations came from the Maritimes, or from a small remote community somewhere in Que, or Ontario.
In the case of High Level, it's an extremely remote community, and the levels of high school graduations are low, but not different than other remote communities anywhere in Canada. It's a crisis facing Canada really.